“Ryder you incredible, unique, hilarious, loving human, I love you beyond. Happiest Birthday @mr.ryderrobinson.
“PS Now your life is your responsibility and outta my hands! Good luck son!!
Hudson, known for known for rom-com roles such as How To Lose A Guy In 10 Days, You, Me And Dupree and Bride Wars, recently became engaged to long-term partner musician Danny Fujikawa.
The couple welcomed their first child – a daughter – in 2018, and Hudson has a second son – Bingham, eight – from a previous relationship.
She was married to Black Crowes frontman Chris Robinson from 2000-2007 and was engaged to Muse singer Matt Bellamy from 2011-2014.
Kate Hudson jokes her son’s life is ‘outta my hands’ as he turns 18